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    Subject[PATCH v2] RISC-V: Increase range and default value of NR_CPUS
    Date
    Currently, the range and default value of NR_CPUS is too restrictive
    for high-end RISC-V systems with large number of HARTs. The latest
    QEMU virt machine supports upto 512 CPUs so the current NR_CPUS is
    restrictive for QEMU as well. Other major architectures (such as
    ARM64, x86_64, MIPS, etc) have a much higher range and default
    value of NR_CPUS.

    This patch increases NR_CPUS range to 2-512 and default value to
    XLEN (i.e. 32 for RV32 and 64 for RV64).

    Signed-off-by: Anup Patel <apatel@ventanamicro.com>
    ---
    Changes since v1:
    - Updated NR_CPUS range to 2-512 which reflects maximum number of
    CPUs supported by QEMU virt machine.
    ---
    arch/riscv/Kconfig | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
    index 5adcbd9b5e88..423ac17f598c 100644
    --- a/arch/riscv/Kconfig
    +++ b/arch/riscv/Kconfig
    @@ -274,10 +274,11 @@ config SMP
    If you don't know what to do here, say N.

    config NR_CPUS
    - int "Maximum number of CPUs (2-32)"
    - range 2 32
    + int "Maximum number of CPUs (2-512)"
    + range 2 512
    depends on SMP
    - default "8"
    + default "32" if 32BIT
    + default "64" if 64BIT

    config HOTPLUG_CPU
    bool "Support for hot-pluggable CPUs"
    --
    2.25.1
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